Energy comparison customers will find the news that a fifth member of the Big Six energy suppliers has raised its prices "hard to swallow", according to Consumer Focus.
Director of external affairs Adam Scorer noted that npower's customers have been dreading the announcement.
"It will not come as a surprise, but it will be a source of great frustration when profits are up," he noted.
"Customers didn't feel much benefit when wholesale costs were low but have seen prices rocket when costs have gone up. With wholesale costs around a third lower than their peak, understandably people are questioning whether it is right that customers face all-time high prices."
Mr Scorer added that industry watchdog Ofgem needs to investigate these price hikes to make sure pricing is fair on customers, and if it cannot do this it should refer the energy market to the Competition Commission.
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